Rollup merge of #111649 - Nilstrieb:derive-const-param-ty, r=BoxyUwU

Add derive for `core::marker::ConstParamTy`

This makes it easier to implement it for a type, just like `Copy`.

`@BoxyUwU` half asked me to add it

compiler/rustc_span/src/symbol.rs

@@ -164,6 +164,7 @@ symbols! {
         Capture,
         Center,
         Clone,
+        ConstParamTy,
         Context,
         Continue,
         Copy,